It serves to control supply voltage for appliances sensitive to supply tolerance, protection of the device against under/over voltage.
HRN-3x is band voltage relay, HRN-6x is over/under voltage relay.
HRN-34, HRN-64 - Like HRN-33, but voltage range is DC 6 - 30 V, - Monitoring of battery circuits (24 V).
Voltage Umin adjusted as % of Umax.
3-state indication - LEDs indicating normal state and 2 fault states.
Type of monitored voltage: DC
Monitored levels: undervoltage and overvoltage
Monitored range: 6-30 V
Supply voltage: 1x CO, 16 A
Power supply: from monitored voltage
Dimensions: 90 x 17.6 x 64 mm (3.5˝ x 0.7˝ x 2.5˝)